Update actions/checkout action to v3 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3

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Release Notes

actions/checkout (actions/checkout)

### [`v3`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v353) [Compare Source](https://togithub.com/actions/checkout/compare/v2...v3) - [Fix: Checkout fail in self-hosted runners when faulty submodule are checked-in](https://togithub.com/actions/checkout/pull/1196) - [Fix typos found by codespell](https://togithub.com/actions/checkout/pull/1287) - [Add support for sparse checkouts](https://togithub.com/actions/checkout/pull/1369)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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This PR has been generated by Mend Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

Merging #17 (d5a60a1) into dev (500a699) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #17   +/-   ##
=======================================
  Coverage   74.85%   74.85%           
=======================================
  Files           5        5           
  Lines         501      501           
=======================================
  Hits          375      375           
  Misses        126      126           

Flag	Coverage Δ
unittests	74.85% <ø> (ø)

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